The halting problem
  • Martin Raza
    4
    We know that given any Turing machine m and any input n, we can construct a finite set of sentences ∆ and a corresponding halting sentence H such that ∆ ⊨ H iff TMm eventually halts on input n. Thus if there were an effective method for determining that ∆ ⊭ H then we could solve the halting problem and thereby refute the Church-Turing Thesis.
    However, given that there is an effective positive test for first-order entailment, why cant we solve the halting problem by considering the negation of the halting sentence, viz. ∆ ⊨ ¬H?
    Martin Raza Options
  • tim wood
    9.3k
    considering the negation of the halting sentence, viz. ∆ ⊨ ¬H? — Martin Raza
    Meaning that Δ does not halt? But is not that the same problem? If Δ is not halting, that is not proof as to whether it will or will not halt, yes?

    Which maybe proves I do not understand the question. Sometimes brevity and concision is self-defeating. Could you make the question a bit more transparent?
    tim wood Options
  • Martin Raza
    4
    ↪tim wood


    The question is why can/cant? Explain why or why not we can consider solving the halting problem by consider the negation of the halting sentence
    Martin Raza Options
  • ssu
    8.6k
    ↪Martin Raza
    And doesn't a negation of H leave it quite open?

    Like I cannot give the correct answer, yet here's my answer A and it's not it so there you go.

    Many times people get sidetracked by noticing that there is a correct answer.
    ssu Options
  • jgill
    3.9k
    There is no halting problem concerning this thread.
    jgill Options
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